It was recombined as Capulus intortus by d'Orbigny (1842); it was recombined as Hipponyx intortus by Trechmann (1933); it was synonymized subjectively with Capulus (Krebsia) incurvatus by Weisbord (1962).

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.